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A Multicenter Epidemiologic Study in Primary Care Settings in Hong Kong

Antonio A. T. Chuh, MRCP(UK), MRCP(Irel), MRCPCH, DipDerm; Albert Lee, MPH, FRACGP, FHKCFP, FHKAM(Family Medicine); Nicolas Molinari, PhD

Arch Dermatol. 2003;139:489-493.

Objectives  To investigate the epidemiology of pityriasis rosea in primary care settings in Hong Kong and to analyze for temporal clustering.

Design  Retrospective epidemiologic study.

Setting  Six primary care teaching practices affiliated with a university.

Patients  Forty-one patients with pityriasis rosea, 564 patients with atopic dermatitis (negative control condition), and 35 patients with scabies (positive control condition).

Methods  We retrieved all records of patients with pityriasis rosea, atopic dermatitis, or scabies diagnosed in 3 years. We analyzed temporal clustering by a method based on a regression model.

Results  The monthly incidence of pityriasis rosea is negatively but insignificantly correlated with mean air temperature (_s = -0.41, P = .19) and mean total rainfall (_s = -0.34, P = .27). Three statistically significant clusters with 7, 6, and 7 cases were identified (P = .03), occurring in the second coldest month in the year (February), the second hottest month (July), and a temperate month (April), respectively. For atopic dermatitis (negative control condition), the nonclustering regression model was selected by Akaike information criteria. For scabies (positive control condition), 1 cluster of 20 cases was detected (P = .03).

Conclusions  Significant temporal clustering independent of seasonal variation occurred in our series of patients with pityriasis rosea. This may be indicative of an infectious cause.

From the Department of Medicine, University of Hong Kong (Dr Chuh); Department of Community and Family Medicine, Chinese University of Hong Kong (Dr Lee); and Department of Biostatistics, Institut Universitaire de Recherche Clinique, University of Montpellier I, Montpellier, France (Dr Molinari). The authors have no relevant financial interest in this article.

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Arch Dermatol 2005;141:767-771.
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